Heinrich schlotfeldt



(No Model.) 2 Sheets-Sheet 1. H. SOHLOTFBLDT.

SPEED INDIGATOR No. 574,076. Patented Dec. 29, 1896.

2 Sheets-Sheet 2.

(No Model.)

H ;SOHLOTFELDT.'

A SPEED INDICATOR.

Patented Dec. 29, 1896.

m; uyllbg 1a: Nonms PETERS co, womumon WASHINGTON, n. c..

U NITED STATES PATENT OFFICE.

HEINRICH SCHLOTFELDT, OF KIEL, GERMANY.

SPEED-INDICATOR.

SPECIFICATION forming part of Letters Patent No. 574,076, dated December29, 1896.

Application filed March 21, 1896. Serial No. 584,251. (No modelfiPatented in England November 26, 1895, No. 22,607, and in BelgiumNovember 27,1895,N0.118,576.

T0 (LZZ 1072/0722, it mu/u con/corn.-

Be it known that LHEINRIGH SCHLOTFELDT, a subject of the Emperor ofGermany, and a resident of Kiel, in the German Empire, have invented anew and useful Improvement in Speed-Indicators, of which the followingis a specification, and which has been patented in England by Patent No.22,607,'dated November 26,1895; in Belgium by Patent No. 118,576, datedNovember 27, 1895, and in Austria by patent dated February 22, 1896,Vol. 46, page 643.

The present invention relates to speed-indicators in which by rotationof a centrifugal apparatus moving a fluid a gaseous pressure is producedwhich corresponds to the velocity and is indicated by a pressure-gage.

The novelty of the present invention consists in means hereinafterdescribed and claimed whereby the stuffing-boxes required in similarapparatus are avoided and whereby the measure of the atmosphericpressure 001. responding to a fixed or certain velocity or number ofrotations can be exactly regulated.

The invention is shown in the annexed drawings.

Figures 1 and 2 show the exterior view of the apparatus in elevation andin plan, respectively. Fig. 3 is a vertical central section. Fig. 4 is aplan in section on line 4 4 of Fig. 3.

Lis ashaft turningin a vertically-arranged cylinder 0, which shaft isdriven by means of bevel-gearingb from the shaft S, the number ofrevolutions of which is to be indicated. The lower end of the shaft L,which is hollow, carries the centrifugal disk K, through the lateralholes of which the fluid drawn in at the lower end of the shaft L isthrown out. As a liquid mercury is preferable and is contained in areservoir A and in a float or airvessel 13 in said reservoir, and in theaxis'of which a tube R, closed above and open below, is fastened,possessing holes pierced through it into the interior of the float atthe upper and lower part of the same. The tube R surrounds a tube a",open above and communicating below with the pressure-gage,

and is connected by means of a passage R with the lower open end of theshaft L, while the reservoir A is connected by means of a passage R withthe space in which the disk or body K revolves.

To dispense with stuffing-boxes, the shaft L, having the centrifugaldisk K fast upon it and through which the mercury must rise from below,is putvertically into the inclosing cylinder 0, and the remaining spaceof the cylinder 0 is filled by a cylindrical body D, which fits bothwithin the cylinder and around the shaft.

WVhen the cylindrical disk K is brought into rotation, the mercury isdrawn from the float B through the tube R and passage IR and forced intothe reservoir A through the passage R By this process the air in thefloat or air vessel B, the tube r, and the tube 1", leading to thepressure-gage, is exhausted or rarefied. The measure of rarefaction isproportional to the speed of rotation of the disk K. In order, however,to regulate the measure of the atmospheric pressure in B exactly for afixed number of revolutions, an adj usting spindle or pin H has beenadded, by means of which the opening of a passage R ,connecting thepassages R and R can be adjusted.

When H is raised from its seat more or less,

more or less liquid will run through the passage R and the atmosphericpressure in the float B is lessened more or less.

\Vhat I claim as my invention is- 1. The combination of theliquid-reservoir A, the hollow float B in said reservoir having anattached tube R open at the bottom but closed at the top and havingcommunication with the upper and lower portions of the space within thefloat, the air-tube arranged Within and open at its upper end to saidtube R and having at its lower end provision for connection with apressure-gage, the cylinder 0 having at its bottom a suction-passage Rcommunicating with the open bottom of the tube R and having above apassage R communicating with the bottom of the reservoir A, the saidpassages R R having a connecting passage R between them, the centrifugaldisk K and its shaft L arranged in the cylinder 0 and havinglateralopenings forming communications through the center of said shaft betweensaid passages R R and the regulating-screw H for giving more or lessopening to the said passage R", snbsl'andisk, substantially as and forthe purpose tially as herein de'seribed. herein described.

2. The combination with the cylinder D A T y i y y and the centrifugaldisk K and its shaft L HEILRHJH SOHLOTFELDI' 5 contained Within saidcylinder, of the cylin- \Vitnesses:

drical body D filling the space between said A. SOHAPER,

cylinder and shaft above said centrifugal ll. LEIDENFROsT.

